Ments



Dec. 17,1929. C. A. BORNMANN ,7 2

FILM S'HIFTVER Filed July Q19, 1927 INV ENTOR CARL fi. BORNNANN.

/ y- H8 2- Fi -61 ATTOR "Patented Dec. 17, 1929.

UNITED STATES PATENT o'FncE-w I our. AQBOBNHANN, or nnwonmron, NEW YORK,ASSIGNOR, BY MESYNEQASSIGN- mamas, ro AGFA ANSCO conronarron, ornmenamron, NEW YORK, A CORPORA- TION 01 NEW YORK Application filed July19 4 wherein a strip of perforated film is wound from one coil toanother past an exposure station in the camera, by means of a slidableclaw mechanism which engages the perforations of the film to move thesame in one direc- 'tion. Sliding movement of such claw memher ispredetermined as to distance and a ment whereby a predetermined amountof film is moved upon each operation of the slide, v a In such a ,camerait sometimes occurs through accident or inadvertence that the slidingfilm shifter is not moved its full distance before being returned forthe next operation. Obviously, in such event, the section of film justexposed prior to such movement would not be'moved completely out of theexposure area and the new section oftfilm would not be moved completelyinto exposure position. The primary ob ect of my invention is to providemeans for preventing such par- 2 tial movement of the part of the filmshifter whereby the shifter must be moved its full distance at eachoperation.

Anotherobject is to provide such a shifter "device wherein the filmshifter is prevented from return movement until it has completed itsfull film moving stroke.

' A still further object is to provide such a device which is simple andautomati'c in operation and of few parts whereby very little cost isadded to the construction of the camera. Other objects and advantages indetails of construction and operation will be apparent as thedescription proceeds, referencenow'be- -4 ing had tothe figures of theaccompanying 7 drawing wherein like reference numerals indicate likeparts, A

In the drawing 7 Figure 1 is a side elevation of 'acameraequipped withmy improved filmushifter, cerwith the perforations of the FILM SHIFTEB192?. Serial 1T0. 206,967.

tain parts being broken away to show the shifting mechanism,-

Figure 2 is a plan view of the shifter mechanism with certain' partsbeing removed to clearly illustrate the shifter device.

Figure 3 is a side view of the shifting mechamsm.,

Figure 4 is a detail perspective of p the shifter device in lockingposition. 10 stop device provided for limiting such move- Thereferencenumeral 1 refers to a camera provided with a view finder 2 andwith film magazines 3 and 4. The film 5 is adapted to be moved from theupper magazine 3 downwardly past an exposure area 6 and into the filmmagazine 4. The removable back 7 of the camera is provided on its innersurface with a plate8 suitably secured to the back as by the screws 9.The side edges of this plate 8 areturned inwardly to form the guidingflanges 10 for a slide 11 movable lengthwise of the plate.

.Pivoted to the upper end of the slide 11 as at 12 is a claw member 13,the teeth of which are adapted to engage within the perfora- 121011814:of the film 5 whereby to move such film downwardly when the slide andclaw member are so moved. The leaf spring 15 is secured to th slide 11and engages against the underside of the claw member 13 whdr eby tonormally and resiliently hold such claw member outwardly into engagementwith the film 5. As will be observed in Figure 1, the teeth of the clawmember 13 are provided with straight lower edges and with bevelled upperedges. Obviously therefore when the slide 11 carrying the claw member ismoved downwardly the straight edlg'es will engage 1m to move the filmdownwardly, whereas on the return movement of the slide upwardly, thebevelled upper edges of the claw will ride out of the perforations,ratchet like, and re-nter the perforations at thetop of this strokeready for I another, I downward pull. A presser pad 16 carried byfaspring 17 removably secured to a dog 25.,

is adapted to normally engage the film 5 and hold it in flat engagementwith the film guide 19 in the camera.

Coil springs 20 ends attached to cars 21 extending laterally of theslide 11 at its lower end and curved upward] over the guide flanges 10.Obviously, there ore, when the slidell is pulled down ward, the spring10 will return the slideand claw member upwardly to the startingposition upon release by the operator.

The back 7. is provided with an elongated recess 22 through whichprojects a ger piece 23 secured to this slide 11. This provides movingmeans for moving such slide.

Loosely pivoted on the slide 11,-as at 24 is one end 26 of which,adjacent the pivot 24, is straight and flat. A leaf spring 27 isanchoredat both ends as at 28 and is at all times in engagement with thestraight end 26 of the dog, thus normally holding such dog. in thehorizontal position shown in- Figure 2.

The opposite end 29 of the dog is roiinded J and adapted to engagewithin either of the notches 30 or 31 located at spaced points on thelower end of the guide flange 10.

The parts just described are shown in full lines in Figure 2 in theirnormal position.

Upon the downward movement of the slide 11, the rounded end 29 of thedog 25 will engagewith the, edge of the guide flange 10 which will rocksuch 'dog' on its pivot as shown in Figure 4,. against the tension ofthe leaf spring 27. Continued downward moverhent of the slide 11carrieswith it the dog 25 sliding along the-edge of the flange 10 untilthe downward stroke is com leted, that is.

until the lower .end of the sl de 11 engages withthe post 18 formingastop therefor,

.whereupon the end 29 of the dog 25 will engage within the lower notch31in the guide flange and resume its normal horizontal position as shownin Fi re 2 in dotted lines. After completing suc movement, the operatorreleases the finger pi'ece 23, whereupon the spin 20 will return theslide 11 upwardly to its initial position durin which-movement thedog--25- will be rocked in the-o posite direction and again ride on thee ge of the flange 1 0 until it reaches such normal upper position whereit will again engage within the notch 30.

Assuming however that the operator in moving the slide 11 downwardly toshift the film 5 fails-to complete the entiremovement downward andrelease the slidebefore it has moved the film the required distance, itwill be clear that with the dog 25 in the position shown in Figure 4,thatis intermediate the notches 30 and. 31, it will be im the springs 20to return the slide into the upper normal position, due to thefrictional en-' gagement between the nose 29 of the dog and are anchoredat their upper ends to the camera back 7 and at their lower myinvention. I

tain positions of said slide.

'ble fortween limits of movement.

the edge of the guide flan e 10, the flat spring 27 exerting tension ont e dog to maintam such engagement. The operator knows therefore that emust move the slide 11 still further do nwardly and finish theshiftingof the film before the slide will return into position formoving the next section of film. In

fact this pivoted dog 29 forms a positive lock for the shiftingmechanism until ithas'completed its downward movement and the-dog 25engaged within the lower notch 31 whereupon the slide may be returned.

Of course, many changes may be made in details of construction andoperation without departing from the spirit and 'sco e of do not limitmyself t erefore to'the exact .structure shown and described, other thanby the appended claims.

I claim v 1. In combination, in a camera, a reciproeating film shifter,means for moving said shifter in one direction,-means for returning saidshifter to. starting position, and means for preventing the return ofsaidshifter before completion of the first named movement.

2. In combination, in a camera, a reciprocating film shifter havinglimited movement,

'means fdrmoving saidshifter in one direction, means-for automaticallyreturning said shifter to starting position, and means for preventingthe return of said shifter before 5 the completion of the first namedmovement.

3. In combination, in a camera, areciproeating 4 film shifter, stops forlimiting the movementof saidshifter in both directions, manual means formoving said shifter to. one of said stops, means for automaticallyreturning said shifter to the other oflsaid stops, and means forpreventing such" return of said shifter before the completion of thefirst named movement. I

4. In combination, in a camera, a reciprocating film shifter comprisinga slide carrying a claw for engaging a film to move it in one direction,a guideway for said slide and no means on said slide cooperatin withsaid guideway' for. locking said shde against- .movement in onedirection in certain posia guideway for sa ety device onlsaid slide andcooperating with saidguideway whereby movement of said shde in onedirection is prevented in an I 6. combination, in a camera, aguideway, arec procating film shifter, comprising a slide carrying a clawengageable with afiln tomoveit in one direction, the movement of sandslide being limited in both directions and a pawl pivoted on said slideand having fric-- tional en gement' with guideway 'be- 7. Incombination, in a camera, 'a guideway, a reciprocating film shifter,comprising a slide carrying a claw engageable with a film to move it inone-dir'ectiomthe movement ofsaid slide being limited in both directionsand a-pawl pivoted on said slide and having frictional engagement withsaid guideway between said limits of movement, said guideway havingnotches at the limits of movement of said slide whereby to permit saidpawl to-rock on its pivot freeof'said guide} way. v

' a .CARL A. BORNMANN.

